9991109001 has 16 divisors (see below), whose sum is σ = 13684405568. Its totient is φ = 6479352000.

The previous prime is 9991108997. The next prime is 9991109041. The reversal of 9991109001 is 1009011999.

It is not a de Polignac number, because 9991109001 - 2² = 9991108997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991109041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004151 + ... + 1014051.

It is an arithmetic number, because the mean of its divisors is an integer number (855275348).

Almost surely, 2^9991109001 is an apocalyptic number.

It is an amenable number.

9991109001 is a deficient number, since it is larger than the sum of its proper divisors (3693296567).

9991109001 is a wasteful number, since it uses less digits than its factorization.

9991109001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19032.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 9991109001 is about 99955.5351193720. The cubic root of 9991109001 is about 2153.7959981517.

The spelling of 9991109001 in words is "nine billion, nine hundred ninety-one million, one hundred nine thousand, one".